/*
package com.meihuayishu.backend.service.impl;

import com.meihuayishu.backend.entity.User;
import com.meihuayishu.backend.repository.UserRepository;
import com.meihuayishu.backend.service.MembershipService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Service
@RequiredArgsConstructor
@Slf4j
public class MembershipServiceImpl implements MembershipService {
    
    private final UserRepository userRepository;
    private final RedisTemplate<String, String> redisTemplate;
    
    private static final String DAILY_DIVINATION_PREFIX = "daily:divination:";
    private static final String MONTHLY_AI_PREFIX = "monthly:ai:";
    
    @Override
    public Map<String, Object> getMembershipInfo(String userId) {
        User user = userRepository.findById(Long.valueOf(userId))
                .orElseThrow(() -> new RuntimeException("用户不存在"));
        
        // 获取使用统计
        Map<String, Object> usage = Map.of(
                "dailyDivinationLimit", getDailyDivinationLimit(user.getMembershipType()),
                "dailyDivinationUsed", getDailyDivinationUsed(userId),
                "monthlyAiInterpretationLimit", getMonthlyAiLimit(user.getMembershipType()),
                "monthlyAiInterpretationUsed", getMonthlyAiUsed(userId)
        );
        
        // 构建权限列表
        List<Map<String, Object>> privileges = getPrivileges(user.getMembershipType());
        
        return Map.of(
                "membershipType", user.getMembershipType(),
                "status", "ACTIVE",
                "expiryDate", user.getMembershipExpiry(),
                "remainingDays", calculateRemainingDays(user.getMembershipExpiry()),
                "autoRenewal", false, // TODO: 实现自动续费逻辑
                "privileges", privileges,
                "usage", usage,
                "benefits", getBenefits(user.getMembershipType())
        );
    }
    
    @Override
    public Map<String, Object> getMembershipPlans() {
        List<Map<String, Object>> plans = List.of(
                Map.of(
                        "planId", "free",
                        "name", "免费版",
                        "type", "FREE",
                        "price", 0,
                        "originalPrice", 0,
                        "currency", "CNY",
                        "duration", "PERMANENT",
                        "features", List.of("每日5次占卜", "基础卦象解读", "历史记录保存30天"),
                        "limitations", List.of("无AI智能解读", "含广告内容"),
                        "recommended", false,
                        "popular", false
                ),
                Map.of(
                        "planId", "vip_monthly",
                        "name", "VIP月卡",
                        "type", "VIP",
                        "price", 29.9,
                        "originalPrice", 39.9,
                        "currency", "CNY",
                        "duration", "MONTHLY",
                        "features", List.of("无限占卜次数", "AI智能解读", "无广告体验", "专业级解读", "数据云备份"),
                        "limitations", List.of(),
                        "recommended", true,
                        "popular", false
                ),
                Map.of(
                        "planId", "vip_yearly",
                        "name", "VIP年卡",
                        "type", "VIP",
                        "price", 299,
                        "originalPrice", 479,
                        "currency", "CNY",
                        "duration", "YEARLY",
                        "features", List.of("VIP月卡所有功能", "批量起卦功能", "优先客服支持", "数据导出功能", "早期体验新功能"),
                        "limitations", List.of(),
                        "recommended", false,
                        "popular", true
                )
        );
        
        return Map.of(
                "plans", plans,
                "currentPlan", "free", // TODO: 根据用户实际会员类型返回
                "promotions", List.of(
                        Map.of(
                                "code", "NEW_USER_50",
                                "description", "新用户专享5折优惠",
                                "discount", 50,
                                "validUntil", "2024-12-31T23:59:59.000Z",
                                "applicable", List.of("vip_monthly", "vip_yearly")
                        )
                )
        );
    }
    
    @Override
    public boolean checkDailyDivinationLimit(String userId) {
        User user = userRepository.findById(Long.valueOf(userId))
                .orElseThrow(() -> new RuntimeException("用户不存在"));
        
        int limit = getDailyDivinationLimit(user.getMembershipType());
        if (limit == -1) { // 无限制
            return true;
        }
        
        int used = getDailyDivinationUsed(userId);
        return used < limit;
    }
    
    @Override
    public void recordDivinationUsage(String userId) {
        String key = DAILY_DIVINATION_PREFIX + userId + ":" + LocalDate.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        redisTemplate.opsForValue().increment(key);
        redisTemplate.expire(key, 24, TimeUnit.HOURS);
    }
    
    @Override
    public boolean checkAiInterpretationLimit(String userId) {
        User user = userRepository.findById(Long.valueOf(userId))
                .orElseThrow(() -> new RuntimeException("用户不存在"));
        
        int limit = getMonthlyAiLimit(user.getMembershipType());
        if (limit == -1) { // 无限制
            return true;
        }
        
        int used = getMonthlyAiUsed(userId);
        return used < limit;
    }
    
    @Override
    public void recordAiInterpretationUsage(String userId) {
        String key = MONTHLY_AI_PREFIX + userId + ":" + LocalDate.now().format(DateTimeFormatter.ofPattern("yyyyMM"));
        redisTemplate.opsForValue().increment(key);
        redisTemplate.expire(key, 31, TimeUnit.DAYS);
    }
    
    @Override
    public boolean isVipMember(String userId) {
        User user = userRepository.findById(Long.valueOf(userId))
                .orElse(null);
        if (user == null) {
            return false;
        }
        
        return "VIP".equals(user.getMembershipType()) || "PREMIUM".equals(user.getMembershipType());
    }
    
    private int getDailyDivinationLimit(String membershipType) {
        return switch (membershipType) {
            case "FREE" -> 5;
            case "VIP", "PREMIUM" -> -1; // 无限制
            default -> 3;
        };
    }
    
    private int getMonthlyAiLimit(String membershipType) {
        return switch (membershipType) {
            case "FREE" -> 0; // 免费用户不能使用AI解读
            case "VIP" -> 200;
            case "PREMIUM" -> -1; // 无限制
            default -> 0;
        };
    }
    
    private int getDailyDivinationUsed(String userId) {
        String key = DAILY_DIVINATION_PREFIX + userId + ":" + LocalDate.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        String value = redisTemplate.opsForValue().get(key);
        return value != null ? Integer.parseInt(value) : 0;
    }
    
    private int getMonthlyAiUsed(String userId) {
        String key = MONTHLY_AI_PREFIX + userId + ":" + LocalDate.now().format(DateTimeFormatter.ofPattern("yyyyMM"));
        String value = redisTemplate.opsForValue().get(key);
        return value != null ? Integer.parseInt(value) : 0;
    }
    
    private List<Map<String, Object>> getPrivileges(String membershipType) {
        return switch (membershipType) {
            case "VIP", "PREMIUM" -> List.of(
                    Map.of("code", "NO_ADS", "name", "无广告", "description", "享受无广告的纯净体验", "enabled", true),
                    Map.of("code", "PROFESSIONAL_INTERPRETATION", "name", "专业解析", "description", "获取高级AI解读服务", "enabled", true),
                    Map.of("code", "BATCH_DIVINATION", "name", "批量起卦", "description", "支持批量处理多个占卜", "enabled", true),
                    Map.of("code", "PRIORITY_SUPPORT", "name", "优先支持", "description", "享受优先客服支持", "enabled", true),
                    Map.of("code", "EXPORT_DATA", "name", "数据导出", "description", "导出个人占卜数据", "enabled", true)
            );
            default -> List.of(
                    Map.of("code", "BASIC_DIVINATION", "name", "基础占卜", "description", "每日5次基础占卜", "enabled", true)
            );
        };
    }
    
    private List<String> getBenefits(String membershipType) {
        return switch (membershipType) {
            case "VIP", "PREMIUM" -> List.of(
                    "无限占卜次数",
                    "高级AI解读",
                    "专属客服通道",
                    "数据导出功能",
                    "早期体验新功能"
            );
            default -> List.of("每日5次占卜", "基础卦象解读");
        };
    }
    
    private long calculateRemainingDays(LocalDateTime expiryDate) {
        if (expiryDate == null) {
            return 0;
        }
        return java.time.temporal.ChronoUnit.DAYS.between(LocalDateTime.now(), expiryDate);
    }
}
*/